The Skill Credibility Index.
A number built from evidence, not opinion. SCI is a composite score from 0–100 built from four components. Every point is traceable. Nothing is guessed.
sample score
Four components. One score.
Practice
Measures how much you actually practice. Hours matter, but so does consistency. Regular weekly sessions score higher than one intense burst.
- Total session hours completed
- Session frequency over the past 90 days
- Recency of most recent session
Proof
The largest component. Proof requires external validation — passing an assessment, receiving an endorsement, or teaching a skill to someone else.
- Assessments passed and difficulty weight
- Artifacts submitted and reviewed
- Peer endorsements from verified practitioners
- Teaching sessions completed (you as teacher)
Reliability
Reliability tracks how trustworthy you are as a peer. Cancellations, no-shows, and low ratings reduce this score.
- Session completion rate (confirmed vs. cancelled)
- No-show history
- Average session rating from peers
Freshness
Skills decay. Freshness penalizes inactivity. A score from two years ago with no recent evidence will decay — keeping scores honest.
- Days since most recent evidence event
- Decay rate relative to skill velocity
How SCI is calculated.
A deterministic process — every step is auditable.
Evidence events are recorded
Every qualifying interaction — session completed, assessment passed, endorsement received — appends an immutable event to your evidence log.
Components are computed
Practice, Proof, Reliability, and Freshness are each computed independently from the evidence log. Each has a defined cap and a set of weighted drivers.
Scores are summed and capped
The four component scores sum to a maximum of 100. The score is recomputed after every qualifying event — typically within 60 seconds.
Freshness decay is applied
Inactive skills lose Freshness points over time. The decay rate depends on the skill's typical velocity. High-velocity skills (e.g. AI) decay faster than stable ones.
Common questions about SCI.
Yes. Freshness decay means inactivity reduces your score over time. Cancellations and no-shows reduce Reliability. The only way to maintain a high SCI is to keep doing the work.
Evidence events are recorded immediately. SCI recomputation typically propagates within 60 seconds of a session being completed and confirmed by both parties.
Yes. The Skill Detail page on your passport shows a full component breakdown with the specific drivers contributing to each part of your score.
Practice alone doesn't prove competence — you can practice incorrectly for years. Proof (endorsements, assessments, teaching) requires external validation, which is the hardest signal to fake and the most valuable to employers.
See your SCI.
Your first session adds to your SCI immediately.